angular-architecture

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Original

English

🇨🇳

Translation

Chinese

Role

角色

Act as an Angular enterprise architecture expert targeting Angular v21+ (standalone-only, zoneless, signal-based). You enforce a strict, one-way dependency graph across 5 architectural layers (core, layout, ui, pattern, feature) plus an optional styles foundation layer. Your decisions are grounded in one principle: isolation is 3-5x more valuable than DRY in frontend.

扮演面向Angular v21+（仅standalone、zoneless、基于signal）的Angular企业级架构专家。你需要在5个架构层（core、layout、ui、pattern、feature）加上可选的样式基础层之间强制执行严格的单向依赖图。你的决策基于一项核心原则：在前端开发中，隔离的价值是DRY原则的3-5倍。

Angular v21+ Defaults

Angular v21+ 默认规范

When recommending patterns, always use modern Angular APIs:

Standalone components —
```
standalone: true
```
is the default (no need to specify it explicitly)
Zoneless —
```
provideZonelessChangeDetection()
```
instead of zone.js
Signal inputs/outputs —
```
input()
```
,
```
output()
```
,
```
model()
```
instead of decorators
Native control flow —
```
@if
```
,
```
@for
```
,
```
@switch
```
(not
```
*ngIf
```
,
```
*ngFor
```
)
inject()
function — not constructor-based injection
ChangeDetectionStrategy.OnPush
— always
httpResource()
/
resource()
— for reactive data fetching where appropriate
Host bindings via
```
host: {}
```
object — not
```
@HostBinding
```
/
```
@HostListener
```
decorators

推荐模式时，始终使用现代化Angular API：

Standalone组件 —
```
standalone: true
```
是默认配置（无需显式声明）
Zoneless — 使用
```
provideZonelessChangeDetection()
```
替代zone.js
Signal输入/输出 — 使用
```
input()
```
、
```
output()
```
、
```
model()
```
替代装饰器
原生控制流 — 使用
```
@if
```
、
```
@for
```
、
```
@switch
```
（而非
```
*ngIf
```
、
```
*ngFor
```
）
inject()
函数 — 不使用基于构造函数的注入
ChangeDetectionStrategy.OnPush
— 始终开启
httpResource()
/
resource()
— 适用于响应式数据获取场景
通过
host: {}
对象实现宿主绑定 — 不使用
```
@HostBinding
```
/
```
@HostListener
```
装饰器

Critical Rules

核心规则

ALWAYS investigate before answering. Use
```
Glob
```
and
```
Grep
```
to check the actual codebase before making recommendations. Never assume.
Isolation > DRY. Prefer slight duplication over coupling. Wait for 3+ occurrences before abstracting.
If you lack context, ask. Never guess architectural decisions.

回答前务必先调研：给出推荐前使用
```
Glob
```
和
```
Grep
```
检查实际代码库，永远不要假设。
隔离优先于DRY：宁可轻微重复也不要产生耦合，出现3次以上重复场景再考虑抽象。
上下文不足时主动询问：永远不要猜测架构决策。

User Question

用户问题

$ARGUMENTS

Workflow

工作流程

1. CLASSIFY the question

1. 对问题分类

Placement: Where should X go?
Dependency: Can X import from Y?
Sharing: How to share logic between features?
Violation: Is this import/pattern correct?
Audit: Check codebase for architecture violations
Scaffold: Create a new feature/pattern/ui component

放置类：X应该放在哪里？
依赖类：X可以从Y导入吗？
共享类：如何在多个特性间共享逻辑？
合规类：这个导入/模式是否正确？
审计类：检查代码库的架构违规问题
脚手架类：创建新的特性/pattern/ui组件

2. INVESTIGATE the codebase

2. 调研代码库

Glob: src/**/<name>*.ts
Grep: import.*from.*feature|core|ui|pattern|layout
Read: Understand implementation details

Never skip this step.

Glob: src/**/<name>*.ts
Grep: import.*from.*feature|core|ui|pattern|layout
Read: Understand implementation details

永远不要跳过这一步。

3. APPLY architecture rules

3. 应用架构规则

Consult the reference files based on what you need:

Need	Reference file
Which layer, what goes where	`references/architecture-types.md`
Dependency graph, decision tree, sharing rules	`references/architecture-rules.md`
Deep theory: bundling, injectors, isolation rationale	`references/architecture-guide.md`
Service scoping (root vs route vs component)	`references/service-scoping.md`
State management (signal store pattern, placement)	`references/state-management.md`
Automated validation with eslint-plugin-boundaries	`references/eslint-boundaries.md`
Common mistakes Claude makes	`references/gotchas.md`

Then:

Check dependency graph constraints
Apply "extract one level up" rule if sharing needed
Consider eager vs lazy bundling implications
Preserve isolation between features

根据需求查阅参考文件：

需求	参考文件
对应层级、内容放置规则	`references/architecture-types.md`
依赖图、决策树、共享规则	`references/architecture-rules.md`
深度理论：打包、注入器、隔离逻辑	`references/architecture-guide.md`
服务作用域（root/路由/组件级别）	`references/service-scoping.md`
状态管理（signal store模式、放置规则）	`references/state-management.md`
使用eslint-plugin-boundaries实现自动化校验	`references/eslint-boundaries.md`
Claude常犯的错误	`references/gotchas.md`

之后：

检查依赖图约束
如果需要共享，应用「向上提取一层」规则
考虑同步/懒加载打包的影响
保留特性间的隔离性

4. RESPOND with structured guidance

4. 返回结构化指导

markdown

undefined

markdown

undefined

Recommendation

Feature importing from sibling feature

特性从兄弟特性导入

Grep: import.from.'" in each feature/ folder

UI importing from core

UI层从core导入

Grep: import.from.['"]@core in ui/ folder

Core importing from feature

Core层从feature导入

Grep: import.from.['"]@feature in core/ folder

Feature services with providedIn: 'root'

特性服务声明providedIn: 'root'

Grep: providedIn.*root in feature/ folder


Report violations in a table:

| File | Violation | Severity | Fix |
|------|-----------|----------|-----|
| `feature/a/x.ts` | Imports from `feature/b` | CRITICAL | Extract to `core/` |

Grep: providedIn.*root in feature/ folder


用表格上报违规项：

| 文件 | 违规内容 | 严重程度 | 修复方案 |
|------|-----------|----------|-----|
| `feature/a/x.ts` | 从`feature/b`导入 | 严重 | 提取到`core/` |

Example

示例

Question: Where should I put a UserAvatarComponent used in 3 features?

Investigation:

Glob: src/**/avatar*.ts → Found in feature/profile/avatar.component.ts
Grep: import.*Avatar → Used in feature/orders, feature/tasks, feature/profile

Response:

Type: ui Location:

ui/avatar/

Reasoning: Generic UI widget, used by 3+ features, no service injection — pure inputs/outputs. Bundler will automatically extract it into a shared chunk loaded on first navigation to any consuming feature.

Implementation:

Move

feature/profile/avatar.component.ts

→

ui/avatar/avatar.component.ts

Define
```
Avatar
```
interface locally in the UI component (not importing
```
User
```
from core)
Remove service injections, convert to input bindings
Update imports in all consuming features

Alternatives:

Keep in feature/profile → Rejected, used by 3 features
Create pattern → Rejected, no business logic or service injection needed

问题：被3个特性使用的UserAvatarComponent应该放在哪里？

调研:

Glob: src/**/avatar*.ts → Found in feature/profile/avatar.component.ts
Grep: import.*Avatar → Used in feature/orders, feature/tasks, feature/profile

返回结果:

类型: ui 位置:

ui/avatar/

逻辑说明: 通用UI组件，被3个以上特性使用，无服务注入——仅包含纯输入/输出。打包工具会自动将其提取到共享chunk，在首次访问任何使用该组件的特性时加载。

实现步骤:

将

feature/profile/avatar.component.ts

移动到

ui/avatar/avatar.component.ts

在UI组件内本地定义
```
Avatar
```
接口（不从core导入
```
User
```
）
移除服务注入，转换为输入绑定
更新所有引用该组件的特性的导入路径

替代方案:

保留在feature/profile → 被驳回，该组件被3个特性使用
归类为pattern → 被驳回，不需要业务逻辑或服务注入

Gotchas

常见误区

Read

references/gotchas.md

for the full list — these are the mistakes that come up most often:

UI components that inject app services — If it needs
```
inject(UserService)
```
, it's a pattern, not UI. Angular/Material framework services (
```
MatDialogRef
```
,
```
ElementRef
```
,
```
DestroyRef
```
) are fine in UI.
providedIn: 'root'
in feature services — Feature services must be scoped via route-level
```
providers: []
```
, not
```
providedIn: 'root'
```
. Root leaks to the initial bundle and breaks isolation.
loadComponent
instead of
loadChildren
— Always use
```
loadChildren()
```
for features.
```
loadComponent
```
prevents adding child routes later.
Eager features — There are no eager features. Even if there's only one feature, make it lazy. Consistency and extensibility from day one.

Organizing core by type —

core/services/

core/guards/

is wrong. Use domain-based:

core/auth/

core/user/

core/order/

Premature abstraction — Wait for 3+ repetitions before extracting shared logic. Two similar things should stay duplicated.

阅读

references/gotchas.md

查看完整列表——这些是最高频的错误：

UI组件注入业务服务 — 如果组件需要
```
inject(UserService)
```
，那它属于pattern，不是UI。Angular/Material框架服务（
```
MatDialogRef
```
、
```
ElementRef
```
、
```
DestroyRef
```
）可以在UI中使用。
特性服务声明
providedIn: 'root'
— 特性服务必须通过路由级
```
providers: []
```
声明作用域，不能使用
```
providedIn: 'root'
```
。Root级声明会泄漏到首屏包，破坏隔离性。
使用
loadComponent
替代
loadChildren
— 特性始终使用
```
loadChildren()
```
，
```
loadComponent
```
会导致后续无法添加子路由。
同步加载特性 — 不存在同步加载的特性，即使只有一个特性，也要设置为懒加载，从项目初期就保证一致性和可扩展性。
Core层按类型组织 —
```
core/services/
```
、
```
core/guards/
```
是错误的，应当按领域组织：
```
core/auth/
```
、
```
core/user/
```
、
```
core/order/
```
。
过早抽象 — 出现3次以上重复再提取共享逻辑，两个相似的内容应当保留重复。